California Gov. Jerry Brown vetoed a bill that would have placed strict regulations on how law enforcement and other government agencies can use drones, his office said on Sunday.

The measure, which passed the state's Senate and Assembly with broad support, would have required law enforcement agencies to obtain a warrant before using an unmanned aircraft, or drone, except in emergencies such as a fire or a hostage-taking.

"There are undoubtedly circumstances where a warrant is appropriate. The bill's exceptions, however, appear to be too narrow," Brown said in his veto message....